Improvement in safety-valves



UNITED STATES PATENT OFFICE.

ADOLPHUS F. W. NEYNABER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN SAFETY-VALVES.

Specification forming part of Letters Patent No. 116,084, dated June 20, 1871; antedated June 17, 1871.

To all whom it may concern:

Be it known that I,A1)oLPHUs F. W. NEYNA BER, of the city and county of Philadelphia, in the State ofPennsylvania, have invented a certain Improvement in Valves, of which the following is a specification:

' My invention relates to the construction of a valve in which, when used as a safety-valve, the difference of pressure in opening and closing is more reduced than in a valve with a flat or V-seat, and with which the liability to stick or to leakisless than with any other stop or safety-valve.

The drawing is a vertical section of my valve in the state when opening.

A is the valve, resting with its face on the surface of B. The face a is made so as to have very little more area than the inner area at a, having a sharp edge, and giving a seat of only a hairs breadth. The recess from a to b, as shown, is sufficient for the largest size of a valve. The sharp edge of the seat at a makes this valve less liable to stick than a valve with a flat or a V-seat; v

A valve with a so-called V-seat will be jammed in by the expansion and contraction of the metal, but my improved valve will not. It often occurs with a V-seat of a stop-valve that, when used for water-connections, a foreign substance is j amined in between the V-seat whereas with my improved seat it will not occur so often. A valve with a V-seat or a flat seat will differ to the amount of several pounds of pressure in opening and closing when used with about fifty pounds of pressure; whereas my valve closes nearly at the same pressure at which itopens, the diflerence between the inner area and area of face a being very little. Therecess from a to I) gives more play to the escaping steam when the valve opens, and forms the sharp-edge seat, which makes this valve more efficient to close when used as a safetyvalve.

Thus it will be seen that a stop or safetyvalve having a seat as described above will have less adherence to its rest, and will not be jammed in by expansion and contraction of metal; and the difi'erence of pressure between opening and closing of a safety-valve with a seat, as described above, will be much less than in any other safetyvalve ever constructed. To the above-described valvehas to be attached the regular lever, with weight or spring when to be used as a safety-valve, or the valve-stem with screw when to be used as a stop-valve.

I claim as my invention- The construction of valve A, substantially as and for the purpose hereinbefore set forth.

A. F. W. NEYNABER.

Witnesses:

WM. BRAUN, H. M. WILDER. 

